I think they just had this thread the other day. It's a bit of pine branch stuck on the mounted camera, but the 360 degree camera cuts it off in
other angles when piecing the photos together. You can see the low pine trees down the alley that the van or whatever passed.

Geez, I followed this thing more miles, err kilometers, and it must be a branch as someone has already mentioned.

It first appears
here and, if you follow the Via degli Acquaviva trail along the Google SpyCam mobile route it had just
cleared an area that was full of trees.
The cam must have capture a closeup of a branch and repeated that section for several more shots.

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